Heat sensitive switch



FIG. 1 is a front perspective view of a heat sensitive switch showing my new design;

FIG. 2 is a right side view thereof on an enlarged scale;

FIG. 3 is a left side view thereof on an enlarged scale;

FIG. 4 is a rear view thereof on an enlarged scale;

FIGS. 5 and 6 are respectively top and bottom views thereof on an enlarged scale. 

The ornamental design for a heat sensitive switch, as shown and described. 